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Compositions of Ferro-vanadium
V : Fe
52-8 : 45-84
47'4 : 51-20
This is obtained industrially by electro-thermal processes and is used
essentially, together with chromo-molybdenum and molybdenum, for
making molybdenum steels. The elements commonly estimated are
molybdenum, carbon, silicon, manganese, phosphorus, sulphur and tungsten.
1. Determination of the Molybdenum.1-2 grams of the finely
powdered sample are heated at not too high a temperature with about 10
parts of the sodium carbonate and magnesia mixture, the semi-fused mass
being extracted with hot water; these operations are then repeated to
extract any small quantities of molybdenum remaining in the residue (see
Chrome Steels). The two solutions together are made up to 500 c.c. in a
measuring flask and the molybdenum in an aliquot part (50100 c.c.)
determined as in molybdenum steels.
2. Determination of the Carbon.By direct combustion in a current
of oxygen (see Iron, i, 6).
3. Determination of the Silicon, Manganese, Phosphorus and
Sulphur.As in ferro-silicon.
4. Determination of the Tungsten.In an aliquot part of the 500
c.c. of solution (see i, above) the tungsten is determined as in ferro-tungsten.
According to the character of the original ores, different types of ferro-
molybdenum are obtained. These may contain 15-80% of molybdenum
(usually 5°-7°%). fr°m 0-5% (for the more refined products) to 5% of carbon,
0-1-0-5% of silicon and small quantities of manganese, sulphur, phosphorus,
and sometimes tungsten.
The commoner commercial products have the following mean compositions
Compositions of Ferro-molybdenum
Ordinary ferro -molybdenum Refined Rich
53-30 52-00 84-80
0-17 0-09 o-ii
water.ganese, phosphorus, etc. ; that from the blast